Blastibrás has already developed a large number of blasting equipment, adapting them to the materials to be used, the size of the pieces, the quantities involved, the amount of dust generated and the most diverse peculiarities of each case.
However, the basic components in the vast majority of solutions are always the same and can be illustrated as follows:
These are manual or automatic containment units in which the operator remains outside or does not participate in the operation. The most common systems are:
1-1) Simple Ventilated Cabinets:
In Figure 1, a simple and very common solution for manual cabinets is outlined, but it solves the confinement problems with relative efficiency.
The operation (gun and part) takes place inside a closed chamber. An exhaust fan establishes an air circulation inside, which enters through vents and exits from the bottom, creating a negative pressure that guarantees a good confinement.
Gun-ejected material on the workpiece falls to the bottom of the inverted pyramid-shaped enclosure, concentrating on the nozzle.
It then returns to the gun-suction process, establishing continuous recycling.
The air circulation is oriented from top to bottom and through which it passes through the abrasive with dust during its fall to the bake to infer. With this, the settling of dust in the environment is accelerated increasing visibility, as well as it is dragged out, separating from the abrasive that returns to the more or less slime process. The volume and air velocity that can be circulated can be sized to optimize internal visibility conditions and the efficiency of material purification.
The air, before being released into the atmosphere passes through a dust collector.
This solution is generally used with a suction gun and accepts to operate with most conventional abrasives.
1-2) Cyclone Cabinet
A similar cabinet is shown in Figure 2, except that the exhaust is made from the bottom of the bale and the draft draws the contaminated abrasive into a cyclone.
It is an aerodynamic device that by centrifugation retains larger particles separating them from the operating dust. It is a much more efficient purification process but is generally only used with lightweight materials such as glass beads or walnut shells and, more rarely, aluminum oxide. The trapped abrasive accumulates in a lower silo and then returns to the process.
The hood is always mounted after the cyclone ensuring negative pressure throughout. The air returns to the atmosphere purified by a dust collector.
1-3) Pressure Nozzle Cabinets
Pressure nozzles have important peculiar applications. They require pressurized vessels that must be recharged periodically.
Cabinets can also be adapted to use them.
In the sketches (figure 3), the pressurized vessel is fitted at the bottom of the bins where the abrasive accumulates, partially purified by the simple ventilation system, point to recharge the case.
Figure 4 shows a more complex assembly, generally employed when using steel shot, which allows more efficient abrasive purification devices to be interleaved.
The elevator carries the material and unloads it by gravity into the scrubber. The abrasive accumulates in a silo on the pressurized tank.
The elevator can be powered by gravity as shown, or in larger cabinets with the aid of helical threads or another appropriate type of conveyor.
It is important to note that the hood is mounted after the dust collector, which in turn is connected to the scrubber, elevator and cabinet, which ensures negative pressure throughout the system, definitely preventing dust from escaping to the outside environment. .
1-4) Wet Jet Enclosures
By its very nature it is a less polluting process than dry ones. However (figure 5 and 6 below) some features like z containment, hoods, mist filters, mechanical stirrers, abrasion resistant pumps, windshield wipers, cleaning tanks etc. ensure the retention of all moisture and environmental protection.
1-5) Turbined cabinets
They basically use the same resources for abrasive containment, purification and recycling.
They naturally require much higher capacities and heavier abrasion protections.